Ossification centres of the hip

Dr Henry Knipe et al.

Listed below are the ossification centres related to the hip joint:

  • ilium: 8 week in utero
  • ischium: 4-6 months in utero
  • pubis: 4-6 months in utero
  • acetabulum (two centres): puberty

The ilium, ischium and pubis all fuse at 7-9 years. Acetabulum fusion (i.e. replacement of triradiate cartilage) occurs at 20-25 years. 

Proximal femur
  • shaft: 7 weeks in utero
  • femoral head: 4-6 months
  • greater trochanter: 2-4 years
  • lesser trochanter: puberty

All of femoral ossification centres fuse between the ages of 14 and 18. 

Lower limb anatomy
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Article Information

rID: 24706
System: Musculoskeletal
Section: Anatomy
Synonyms or Alternate Spellings:
  • Ossification centres of the hip joints
  • Hip ossification centres

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